`@Test fun x() = runBlocking { ... }` whose block ends in `.apply { }`
returns the DB (non-Unit), so JUnit4 rejects the whole class at runtime
with InvalidTestClassError ("method should be void") — which compiles
fine locally but fails every E2E job on the emulator. Use
`runBlocking<Unit>` (the existing DatabaseEncryptionTest idiom) so the
methods are void while keeping the expression body ktlint expects.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>